/Engine/Source/Runtime/RHI/Public/GPUProfiler.h
Two timestamps performed on GPU and CPU at nearly the same time. This can be used to visualize GPU and CPU timing events on the same timeline.
static [TStaticArray](API\Runtime\Core\Containers\TStaticArray)< [FGPUTimingCalibrationTimestamp](API\Runtime\RHI\FGPUTimingCalibrationTimestamp), 1 > GCalibrationTimestamp;